I track 360 and F430's in the UK. Every car I see (in the real or virtual world) I take a record of as much detail as possible. The chassis number allows me to track cars over plate changes.
I also have contacts in the industry and regular auction goers who share info with me.
My data is split between good cars (the ones I see at events and on forums) and bad cars (eg: ones I look at for people prior to purchase, cars that I see being fixed on the cheap in workshops, reported to me from salvage auctions, etc).
For your (ex) car I have the pictures from the advert, the advert itself, a note that it was owned by a user on Sports Maserati and that it has a full main dealer history.
It is quite likely that I will be asked by a potential purchaser about your car. If I am, I will tell them that I don't have anything bad on the car and what I have stated above (but I wouldn't pass on your user name). Usually I am telling people about missing service history, poorly repaired crash damage, etc, etc.
I understand if you don't wish to reveal the VIN but it is always worth asking for.
Regards,
Aldous.